Motorola A860 Service Manual download pdf (Page 46)

48 June 07, 2004 6809485A78-O

Troubleshooting A840

Troubleshooting

Table 2. Level 1 and 2 Troubleshooting Chart

Symptom Probable Cause Verification and Remedy

1. Telephone will not turn on or stay on.

a) Battery either discharged or

defective.

Measure battery voltage across a 50 ohm (>1

Watt) load. If the battery voltage is <3.25 Vdc,

recharge the battery using the appropriate battery

charger. If the battery will not recharge, replace the

battery. If battery is not at fault, proceed to b.

b) Battery connectors open or

misaligned.

Visually inspect the battery connectors on both the

battery and the telephone. Realign and, if

necessary, either replace the battery or refer to a

Level 3 Service Center for the battery connector

replacement. If battery connectors are not at fault,

proceed to c.

c) Transceiver board defective.

Remove the transceiver board. Substitute a known

good transceiver board and temporarily

reassemble the unit. Press the PWR button; if unit

turns on and stays on, disconnect the dc power

source and reassemble the telephone with the

new transceiver board. Verify that the fault has

been cleared. If the fault has not been cleared then

proceed to d.

d) keyboard assembly failure.

Replace the keyboard assembly. Temporarily

connect a +3.6 Vdc supply to the battery

connectors. Depress the PWR button. If unit turns

on and stays on, disconnect the dc power source

and reassemble with the new keyboard assembly.

2. Telephone exhibits poor reception or

erratic operation such as calls frequently

dropping or weak or distorted audio.

a) Antenna assembly defective.

Check to make sure that the antenna pin is

properly connected to the transceiver board

assembly. If connected properly, substitute a

known good antenna. If the fault is still present,

proceed to b.

b) Transceiver board defective.

Replace the transceiver board (refer to 1c). Verify

that the fault has been cleared and reassemble the

unit with the new transceiver board.

3. Display is erratic, or provides partial or

no display.

a) Connections to or from

transceiver board defective.

Check general condition of flex and flex connector.

If the flex and connector are good, check that the

flex connector is fully connected. If not, check

connector to transceiver board connections. If

faulty connector, replace the transceiver board. If

connector is not at fault, proceed to b.

b) Flip assembly defective.

Temporarily replace the flip assembly with a known

good assembly. If fault has been cleared,

reassemble with the new flip assembly. If fault not

cleared, proceed to c.

c) Transceiver board assembly

defective.

Replace the transceiver board (refer to 1c). Verify

that the fault has been cleared and reassemble the

unit with the new transceiver board.

4. Incoming call alert transducer audio

distorted or volume is too low.

Faulty transceiver board assembly.

Replace the transceiver board (refer to 1c). Verify

that the fault has been cleared and reassemble the

unit with the new transceiver board.

5. Telephone transmit audio is weak.

(usually indicated by called parties

complaining of difficulty in hearing voice).

a) Microphone connections to the

transceiver board assembly

defective.

Gain access to the microphone as described in the

procedures. Check connections. If connector is

faulty proceed to c; if the connector is not at fault,

proceed to b.

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